Give it back

How much money did builders contribute/donate to political parties in the past decade? A lot, I'll warrant though I don't have the figures to hand and I'm not even sure if you could ever find the true amount. But given that millions were spent in the past two decades on tribunals charged with the task of rooting out the misuse of power through bribery and other nefarious activities, there must be a ball park figure available somewhere.
Not that all political donations were given for the purpose of suborning unfair political or commercial advantage either (heavens forbid, eh?).
All that aside, it is now clear the digital money coffers of the political parties have to have expanded, if not in line with, at least in reflection of the inflated wealth of their contributors.
So, my simple question is why don't they give it back?
Think about it. If a political party has a record of these financial contributions from now impecunious and in some cases, disgraced individuals or organizations, should they not, in conscience, give it back.
Whatever way you look at it, the money belongs to the people since they are footing the bill for the princely excesses of these paper magnates. The money, when they donated it, probably came from the free flow of funds available from the likes of Anglo Irish Bank.
So give it back.
Of course, we all know it'll be a cold day in Hell when that's going to happen...